Robert Boschgmbh

Heinz Walter

Egon Tittmann

Gerhard Nonnenmacher

Gunther Stecher

Walter Robeller

Herbert Zimmermann

Dieter Bertsch

Kurt Spitzenberger

Wolfgang Leibfried

Klaus Steinle

Alfred Grob

Karl Rampmaier

Delivery flow and pressure controlling device for a hydrostatic pump

High pressure sensor

Apparatus which regulates the pressure and the rate of flow of fluid supplied by a variable-delivery radial piston or vane pump whose output can be changed by moving a ring-shaped slide block transversely of the rotor. The slide block is engaged by a relatively small piston which is subjected to fluid pressure corresponding to that at the outlet of the pump, and by a relatively large piston which is disposed opposite the smaller piston and is subjected to fluid pressure which is controlled by a regulating valve receiving pressurized fluid from the outlet. The outlet is connected with a set of first consumers, such as hydraulic cylinder and piston units, and the pressure of fluid which is delivered to first consumers can be regulated by a set of series- or parallel-connected pilot valves one of which is permanently connected with the regulating valve and the others of which are connectable to the regulating valve only by discrete two-way valves which can be opened by remote control. The outlet of the pump is further connected to a second consumer, such as a rotary hydraulic motor, by way of several flow restrictors each of which is followed by a digitally controlled shutoff valve. The number of open shutoff valves determines the amount of fluid which flows to the inlet of the hydraulic motor.

Apparatus for regulating the pressure and rate of flow of fluid supplied

Growing community of inventors

Rutesheim, Germany

Heinz Walter